The part(s) or condition(s) listed below for the symptom Air Conditioner won’t run are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
Air Conditioner Won't Turn Off? Air Conditioner Troubleshooting
Air Conditioner Remote Not Working? Air Conditioner Troubleshooting
Air Conditioner Loud or Noisy? Air Conditioner Troubleshooting
Air Conditioner Fan Not Working? Air Conditioner Troubleshooting
Air Conditioner Compressor Won't Run? Air Conditioner Troubleshooting
Air Conditioner Not Cooling? Air Conditioner TroubleshootingControl Board
Main Control Board
User Control and Display Board
Selector Switch
Confirm the air conditioner is plugged in and there is power at the wall receptacle. If the wall receptacle is 120 volts, you can plug another small appliance into the receptacle to confirm there is power. For 220 volt units you will need to use a multimeter. If there is no power, confirm the circuit breaker has not tripped. Most air conditioners will have a separate breaker on the power cord plug. Confirm this breaker is not tripped. If the blower motor is working then the unit has power.
